您要查找的是不是：
- (=direct centrifugal flotation) 直接离心浮选(法) D.C.F.
- GEAR协议 GEAR protocol
- Gear方法 GEAR method
- valve gear (发动机) 气门传动机构
- 请即办理并航空函复。 Please act promptly and let us have your reply by return airmail.
- Fidlers gear 菲德勒式起落架
- 舰队正在和航空进行部队联合演习。 The fleet is manoeuvring in combination with the air unit.
- pressure gear (油泵的) 增压齿轮
- 请给我买几张航空邮票。 Please buy some air mail stamps for me.
- double back gear (车床的) 双背齿轮装置
- 用航空寄还是海运寄呢? Airmail or sea mail?
- Fellows gear shaper 费氏刨齿机
- 我要一封普通邮票和两封航空邮票。 I need a book of regular stamp and two of airmail.
- passengers pull gear 防险闸装置
- 我想往法国寄一封航空挂号信。 I want t send a registered airmail letter to France.
- scroll gear (直径逐渐变化的) 蜗形齿轮
- 当时航空仍在萌芽阶段。 At that time aviation was still in its infancy.
- slewing gear brake (起重机的) 回转机构制动器
- 航空照片可供市民选购。 Aerial photographs are available for sale to the public.
- Walschaerts valve gear 华尔夏特阀动装置
